摘要： 随着云计算下数据外包的流行,可搜索加密的重要性日益凸显。针对Yang等提出的多用户关键词合取搜索方案中,用户必须给全所有关键词值这一局限,设计了一个改进方案。随后,详细分析了新方案的正确性、安全性及运行效率。分析表明,新方案在维持原方案安全性的基础上,实现了用户仅需提交部分关键词这一实用功能。新方案运行效率出色,在云计算“瘦客户机”应用背景下有一定的实践价值。最后附带给出了新方案的一个简易实现。
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